No window decorations,, no settings

Hi,

I've tried to install compiz over xfce4 (from synaptic), which have failed with some errors. I remove it from synaptic, and now all windows are docked to left side top of the screen,having no decorations at all, no caption and switching between them does not work.All windows are stacked on top of eah other and clicking does not bring the window to top (latest stacks up).Also the xfce4-settings pages : window manager tweaks & windows manager are blank.